Malicious PDF — malware analysis report

Static analysis result for SHA-256 e621b5d3a63b79eb…

MALICIOUS

PDF

86.1 KB Created: 2021-07-04 17:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3e9f41292669310342ebd4d7ef9a53aa SHA-1: 34f3ba391fe4e1a9f4fb017d1db027b670f531d9 SHA-256: e621b5d3a63b79eb7bf74fc6da9b72e11fe0a4f1b7219c4c3d9757876b2ac8cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and the nature of the link farm suggest an attempt to lure users to malicious resources, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980878ea959---3587029923.pdf In PDF document text
    • http://caratow.nl/userfiles/file/nenutagakeb.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c01490b8d08e9262518cb7322e9ff7ba/zoverijubuvoxe.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0405371a9---jujanaduvipelunufituxelow.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3sot435venf5751gganh49ln30/63773143430.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/81732554617.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/97540538967.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf8a2cc7ec---nexumujaxazozobazan.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sulurusiwekun.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1591dc865db2e80481f25cf1f6e8956d/34242326545.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e38c9c22a---fufonomexarawodu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e288274a0a---fibemebibewafe.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e6rdsq2vuh7c48obpsp74tujt5/wuwinuzokijumu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf2c915e9---dalepop.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/fokev.pdfIn PDF document text
    • http://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/pevinol.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/zovadi.pdfIn PDF document text
    • http://absigorta.com/E/file/71442149628.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c185d2dd47---petalemagipelatid.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/8035133414.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a736ebba3c9d2d04ea577a609f1c6c53/80958280426.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/miwifilezubirukuvobarala.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160944d287211b---mudujulifawidoxazutusok.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/34207909771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+oz+is+in+1+gallonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 17448 bytes
SHA-256: f6726782a5fbe470ce03d17730cbc1e49ebd912b95d8071ac3f7c504e99b95ef
font_02_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10424 bytes
SHA-256: 795e2e8e995111f81523dac4fb496ea53963acc1ee56c419bfd641edb31ef2d5

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